Jinchuuriki have tons of chakra, due to the Tailed Beast sealed in them. Their Chakra is said to be unmatched. However, there are a few Non-Jinchuuriki who possess the highest chakra.
Here are 5 Non-Jinchuuriki with the highest chakra in Naruto.
5. 4th Raikage
4th Raikage is one of the strongest Naruto Characters. He is said to have insane amounts of Chakra, matched by only a few known people. A fought Edo Tensei Madara Uchiha for a very long time, along with other 4 Kage.
According to Karin, A’s chakra reserves are comparable to those of a Tailed Beast. He was able to fight Eight Tails, and even managed to sever one of its horns.